Capacitive Interfaces for Navigation of Electric Powered Wheelchairs

Abstract

This paper presents the design of capacitive interfaces, developed on standard printed-circuit boards, which allow persons with muscular weakness the ability to navigate an electric powered wheelchair by small finger movements. The goal was to develop a high-quality and reliable capacitive-sensor interface that was easy to use, met ergonomic requirements and reduced the mobility requirements needed by that of a standard joystick user. Usability and acceptability criteria were also considered. An Assistive Device Platform was also developed to allow the sensors to interface to a wheelchair platform. The sensors were connected to the platform through an I2C connection. The platform can also accommodate for other sensors such as accelerometers and switch interfaces requiring digital interfaces such as SPI, parallel and serial connections thus accommodating for a wider range of motor disabilities. The platform has been tested by able and non-able bodied users.